Java The Complete Reference, Seventh Edition

Void

TheVoidclass has one field,TYPE, which holds a reference to theClassobject for typevoid.

You do not create instances of this class.

Process

The abstractProcessclass encapsulates aprocess—that is, an executing program. It is used

primarily as a superclass for the type of objects created byexec( )in theRuntimeclass, or

bystart( )in theProcessBuilderclass.Processcontains the abstract methods shown in

Table 16-10.

Chapter 16: Exploring java.lang 403

Method Description

static boolean

getBoolean(StringpropertyName)

Returnstrueif the system property specified by

propertyNameistrue. Other wise, it returnsfalse.

int hashCode( ) Returns the hash code for the invoking object.

static boolean parseBoolean(Stringstr) Returnstrueifstrcontains the string “true”. Case is

not significant. Other wise, returnsfalse.

String toString( ) Returns the string equivalent of the invoking object.

static String toString(booleanboolVal) Returns the string equivalent ofboolVal.

static Boolean valueOf(booleanboolVal) Returns theBooleanequivalent ofboolVal.

static Boolean valueOf(StringboolString) ReturnstrueifboolStringcontains the string “true” (in

uppercase or lowercase). Other wise, it returnsfalse.

TABLE 16-9 The Methods Defined byBoolean(continued)

Method Description

void destroy( ) Terminates the process.

int exitValue( ) Returns an exit code obtained from a subprocess.

InputStream getErrorStream( ) Returns an input stream that reads input from the process’

erroutput stream.

InputStream getInputStream( ) Returns an input stream that reads input from the process’

outoutput stream.

OutputStream getOutputStream( ) Returns an output stream that writes output to the process’

ininput stream.

int waitFor( )

throws InterruptedException

Returns the exit code returned by the process. This method

does not return until the process on which it is called

terminates.

TABLE 16-10 The Methods Defined byProcess